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Photodissociation Processes In Molecular Beams
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Book Synopsis Photodissociation Processes in Molecular Beams by :
Download or read book Photodissociation Processes in Molecular Beams written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A description is presented of a study of the photodissociation dynamics of molecules in a molecular beam. Photo-fragmentation translational spectroscopy has been utilized to observe the photodissociation dynamics of ozone. Using a supersonic molecular beam and a 10 nanosecond pulsed laser at lambda = 266 nm, the velocities of the fragment products are measured by the method of time of flight. The resolution of the time of flight spectrum of ozone is sufficiently high that the electronic and vibrational states are clearly resolved and identified. Above the threshold (lambda 310 nm), the quantum yield for the production of O(1D) has been estimated in the past to be unity for the process O3 (1A1) + h.nu.)lambda 300 nm) .--. O3(1B2) .--. O2(1.delta./sub g/) + O(1D). However a small production of O2 (3.sigma./sub g/−) + O(3P) has been observed in this study. The O2(1.delta./sub g/) product yields four vibrational states (v = 0, 1, 2, 3) which yields a vibrational temperature of 2700°K along with narrow energy distributions of rotational levels. These energy distributions are compared with photodissociation models along with the polarization dependence of the dissociative process which was also measured. 143 references.
Book Synopsis Photodissociation Processes in Molecular Beams by : Lee Richard Carlson
Download or read book Photodissociation Processes in Molecular Beams written by Lee Richard Carlson and published by . This book was released on 1979 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molecular Beam Studies of Reactive Scattering, Surface Scattering, and Photodissociation Processes by : Pedro Recio Ibáñez
Download or read book Molecular Beam Studies of Reactive Scattering, Surface Scattering, and Photodissociation Processes written by Pedro Recio Ibáñez and published by . This book was released on 2020 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proposed Molecular Beam Determination of Energy Partition in the Photodissociation of Polyatomic Molecules by : Richard N. Zare
Download or read book Proposed Molecular Beam Determination of Energy Partition in the Photodissociation of Polyatomic Molecules written by Richard N. Zare and published by . This book was released on 1964 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultraviolet Photodissociation of Molecular Beams by : R. Bersohn
Download or read book Ultraviolet Photodissociation of Molecular Beams written by R. Bersohn and published by . This book was released on 1980 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ar-F laser (193 nm) was used to photodissociate molecular beams of SO2, CS2, aryl halides, phenyl cyanide and isocyanide, nitroalkenes and nitrobenzene, and H2O2. The translational energy distributions of the fragments were measured. In addition, the internal energy distributions of CS (from CS2) and OH fragments from H2O2 were measured. The excess of photon energy over bond energy is released primarily as vibration for SO2 and primarily as translation for H2O2. For CS2 comparable amounts of energy appear in translation and vibration; 80% of the S atoms appear in the 1(D) state. Both phenylcyanide, C6H5CN and phenylisocyanide, C6H5NC gave CN and C6H5 fragments. In spite of the greater energy available, C6H5NC yielded slower CN fragments. The iodobenzene fragmentation occurred by two processes, one from the initially excited state which gave fast fragments and the other from a lower energy state which gave slower fragments and, of course, more internal energy. (Author).
Book Synopsis Atomic and Molecular Beams by : Roger Campargue
Download or read book Atomic and Molecular Beams written by Roger Campargue and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1013 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title covers the state of the art in this field both theoretically and experimentally. With contributions from leading researchers including several Nobel laureates, it represents a long-lasting source of reference on all aspects of fundamental research into or using atomic and molecular beams.
Book Synopsis Vacuum Ultraviolet Photoionization and Photodissociation of Molecules and Clusters by : Cheuk-Yiu Ng
Download or read book Vacuum Ultraviolet Photoionization and Photodissociation of Molecules and Clusters written by Cheuk-Yiu Ng and published by World Scientific. This book was released on 1991 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph reviews the recent progress in vacuum ultraviolet (VUV) photoionization and photodissociation processes. Photoionization, photoelectron, and fluorescence spectroscopic techniques have played an important role in revealing the photoionization and photodissociation dynamics of molecules in the vacuum ultraviolet region and in providing accurate energetic and spectroscopic information of ions as well as neutral molecules. The book represents the first detailed review of major experimental developments in the studies of single vacuum ultraviolet photon ionization and dissociation processes of gaseous molecules and clusters.
Book Synopsis Photodissociation of Cyclic Compounds in a Molecular Beam by : Xinsheng Zhao
Download or read book Photodissociation of Cyclic Compounds in a Molecular Beam written by Xinsheng Zhao and published by . This book was released on 1989 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unimolecular Photodissociation Studies in Molecular Beams and Flow Tubes by : Wyatt Gibson Merrill
Download or read book Unimolecular Photodissociation Studies in Molecular Beams and Flow Tubes written by Wyatt Gibson Merrill and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We conduct studies utilizing unimolecular photodissociation in two apparatus: (1) a high vacuum molecular beam chamber capable of time-of-flight mass spectrometry and velocity map imaging and (2) a newly constructed high-pressure flow tube apparatus with laser-induced fluorescence detection. Tunable, pulsed ns-laser systems initiate photodissociation in both experiments and probe the resultant products. The molecular beam apparatus resolves quantum-specific product states following CHBrCl2 photodissociation in the Ã-band, leading to CHCl2 and Br photofragments. We use resonance enhanced multiphoton ionization to distinguish between the spin-orbit states of the Br products and velocity map imaging to probe energy disposal at a variety of photolysis wavelengths. We examine the role of electronic surface crossing in the dynamics and relative quantum yields for the exit channels. Additionally, we constructed and characterized a flow tube apparatus designed for measurements of unimolecular kinetics relevant to atmospheric chemistry. The work presented will cover methodology for characterizing fluid dynamics in the flow tube and the laser-induced fluorescence detection capabilities we use to probe products generated in the flow. By varying the transport properties of the flow, we aim to extract rate coefficients for unimolecular processes that compete with bimolecular chemistry in the troposphere under a variety of conditions.
Book Synopsis Molecular Beam Photodissociation Studies of Polyatomic Molecules and Radicals by : Eric J. Hintsa
Download or read book Molecular Beam Photodissociation Studies of Polyatomic Molecules and Radicals written by Eric J. Hintsa and published by . This book was released on 1989 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photodissociation Dynamics by : Reinhard Schinke
Download or read book Photodissociation Dynamics written by Reinhard Schinke and published by Cambridge University Press. This book was released on 1995-05-11 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photodissociation induced by the absorption of single photons permits the detailed study of molecular dynamics such as the breaking of bonds, internal energy transfer and radiationless transitions. The availability of powerful lasers operating over a wide frequency range has stimulated rapid development of new experimental techniques which make it possible to analyse photodissociation processes in unprecedented detail. This text elucidates the achievements in calculating photodissociation cross-sections and fragment state distributions from first principles, starting from multi-dimensional potential energy surfaces and the Schrödinger equation of nuclear motion. Following an extended introduction in which the various types of observables are outlined, the book summarises the basic theoretical tools, namely the time-independent and the time-dependent quantum mechanical approaches as well as the classical picture of photodissociation. The discussions of absorption spectra, diffuse vibrational structures, the vibrational and rotational state distributions of the photofragments form the core of the book. More specific topics such as the dissociation of vibrationally excited molecules, emission during dissociation, or nonadiabatic effects are also discussed. It will be of interest to graduate students and senior scientists working in molecular physics, spectroscopy, molecular collisions and molecular kinetics.
Book Synopsis Molecular Beam Studies of Photodissociation Reactions by : Douglas John Krajnovich
Download or read book Molecular Beam Studies of Photodissociation Reactions written by Douglas John Krajnovich and published by . This book was released on 1983 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molecular Beam Studies of Reaction Dynamics by :
Download or read book Molecular Beam Studies of Reaction Dynamics written by and published by . This book was released on 1990 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major thrust of this research project is to elucidate detailed dynamics of simple reactions that are theoretically important and to unravel the mechanism of complex chemical reactions or photochemical processes that play important roles in many macroscopic processes. Molecular beams of reactants are used to study individual reactive encounters between molecules or to monitor photodissociation events in a collision-free environment. Most of the information is derived from measurement of the product fragment energy, angular, and state distributions. Recent activities are centered on the mechanisms of elementary chemical reactions involving oxygen atoms with unsaturated hydrocarbons, the dynamics of endothermic substitution reactions, the dependence of the chemical reactivity of electronically excited atoms on the alignment of excited orbitals, the primary photochemical processes of polyatomic molecules, intramolecular energy transfer of chemically activated and locally excited molecules, the energetics of free radicals that are important to combustion processes, the infrared-absorption spectra of carbonium ions and hydrated hydronium ions, and bond-selective photodissociation through electric excitation. 34 refs.
Book Synopsis Molecular Beam Anisotropic Photodissociation with Polarized Light by : Michael James Dzvonik
Download or read book Molecular Beam Anisotropic Photodissociation with Polarized Light written by Michael James Dzvonik and published by . This book was released on 1973 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis PROPOSED MOLECULAR BEAM DETERMINATION OF ENERGY PARTITION IN THE PHOTODISSOCIATION OF POLYATOMIC MOLECULES. by :
Download or read book PROPOSED MOLECULAR BEAM DETERMINATION OF ENERGY PARTITION IN THE PHOTODISSOCIATION OF POLYATOMIC MOLECULES. written by and published by . This book was released on 1964 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Photodissociation and Spectroscopy of Mass-separated Biomolecular Ions by : Nicolas C. Polfer
Download or read book Laser Photodissociation and Spectroscopy of Mass-separated Biomolecular Ions written by Nicolas C. Polfer and published by Springer Science & Business Media. This book was released on 2013-09-03 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: This lecture notes book presents how enhanced structural information of biomolecular ions can be obtained from interaction with photons of specific frequency - laser light. The methods described in the book "Laser photodissociation and spectroscopy of mass-separated biomolecular ions" make use of the fact that the discrete energy and fast time scale of photoexcitation can provide more control in ion activation. This activation is the crucial process producing structure-informative product ions that cannot be generated with more conventional heating methods, such as collisional activation. The book describes how the powerful separation capabilities and sensitivity of mass spectrometry (MS) can be combined with the structural insights from spectroscopy by measuring vibrational and electronic spectra of trapped analytes. The implementation of laser-based photodissociation techniques in MS requires basic knowledge of tunable light sources and ion trapping devices. This book introduces the reader to key concepts and approaches in molecular spectroscopy, and the light sources and ion traps employed in such experiments. The power of the methods is demonstrated by spectroscopic interrogation of a range of important biomolecular systems, including peptides, proteins, and saccharides, with laser light in the ultraviolet-visible, and infrared range. The book "Laser photodissociation and spectroscopy of mass-separated biomolecular ions" is an indispensable resource for students and researchers engaged or interested in this emerging field. It provides the solid background of key concepts and technologies for the measurements, discusses state-of-the-art experiments, and provides an outlook on future developments and applications.
Download or read book The Chemical Bond written by Ahmed Zewail and published by Elsevier. This book was released on 1992-05-14 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: This inspired book by some of the most influential scientists of our time--including six Nobel laureates--chronicles our emerging understanding of the chemical bond through the last nine decades and into the future. From Pauling's early structural work using x-ray and electron diffraction to Zewail's femtosecond lasers that probe molecular dynamics in real time; from Crick's molecular biology to Rich's molecular recognition, this book explores a rich tradition of scientific heritage and accomplishment. The perspectives given by Pauling, Perutz, Rich, Crick, Porter, Polanyi, Herschbach, Zewail, and Bernstein celebrate major scientific achievements in chemistry and biology with the chemical bond playing a fundamental role. In a unique presentation that also provides some lively insights into the very nature of scientific thought and discovery, The Chemical Bond: Structure and Dynamics will be of general interest to scientists, science historians, and the scientifically inclined populous.
